JP2004207299A - Electronic part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide an electronic part having a polarity terminal thickened to indicate a polarity. <P>SOLUTION: An electromagnetic acoustic converter 1 includes a base 24 formed of a magnetic material, a core 22 formed of the magnetic material and stood on the base 24, a diaphragm 20 formed of the magnetic material and supported via an air gap from the distal end of the core, a magnetic circuit constituted together with the base 24, the core 22 and the diaphragm 20, a magnet 25 for supplying a magnetostatic field, a coil 23 disposed on the periphery of the core to supply a vibrating magnetic field to the magnetic circuit, a coil bobbin 30 for holding the coil 23, and lead terminals 41, 42 for energizing. The lead terminal 42 is constituted of a sleeve 51 as the polarity terminal 50. The polarity terminal 50 is a terminal obtained by engaging the sleeve 51 of a substantially C shaped cylindrical member formed of a metal of a solder plated copper wire, etc. at the lead terminal 42 of a positive terminal. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic component having a lead terminal such as an electromagnetic acoustic transducer.
[0002]
[Prior art]
There are positive and negative polarities in the terminals of electronic components such as electromagnetic acoustic transducers.To determine this, a sign that indicates the polarity is printed on the electronic component itself, or the positive polarity lead terminal is extended. In general, a lead terminal showing polarity is used.
Further, a large-diameter lead terminal is used for some of the lead terminals and used as a polar terminal, so that erroneous insertion into a substrate due to a difference in lead terminal diameter has been performed.
[0003]
[Problems to be solved by the invention]
However, when using lead terminals of a plurality of diameters, the terminal fixing structure in the electronic component has to be changed according to the lead terminals of each diameter.
[0004]
Also, if the diameter of the lead terminal embedded in the terminal fixing portion is large, the force applied to the terminal fixing portion from the outside increases, so that the breakage and detachment easily increase, and the terminal fixing portion is replaced with the conventional one. It must be made stronger than a small diameter one, which may lead to an increase in cost.
[0005]
Furthermore, if the lead terminal is bent by the terminal fixing part in order to make it difficult for the lead terminal to come off from the terminal fixing part, if the lead terminal embedded in the terminal fixing part has a large diameter, the thickness of the terminal fixing part may be increased. Unless the strength is increased and secured, there is a possibility that inconveniences such as the inability to fix can occur.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive electronic component having a polar terminal which is made thick to indicate the polarity.
[0007]
[Means for Solving the Problems]
The present invention provides an electronic component having two or more lead terminals, wherein at least one of the lead terminals is covered with a metal member, and the electronic component has a polar terminal having a diameter larger than the diameter of the other lead terminals. It is.
[0008]
Further, according to the present invention, there is provided an electronic component, wherein the metal member is formed of a cylindrical member, and a lead terminal is fitted into the cylindrical member.
[0009]
Further, the present invention is the electronic component, wherein the metal member is constituted by a substantially C-shaped member, and a lead terminal is fitted into the substantially C-shaped member.
[0010]
Further, the present invention is the electronic component, wherein the metal member is constituted by a linear member, and the linear member is wound around a lead terminal.
[0011]
According to the present invention, there is provided an electronic component, wherein a convex portion is formed at a tip portion of the polar terminal.
[0012]
According to the present invention, it is possible to make a specific lead terminal thick without changing the lead terminal itself. The manufacturing process can be simplified and costs can be reduced.
[0013]
Further, according to the present invention, since the lead terminal is made thick by fitting the lead terminal into the cylindrical member, a polar terminal having a uniform thickness can be manufactured, and the reliability can be improved.
[0014]
Furthermore, according to the present invention, the lead terminal is made thicker by fitting the lead terminal into a substantially C-shaped member, so that when an electronic component using the present invention is soldered to a substrate or the like, substantially By flowing the solder between the lead terminal and the substantially C-shaped member from the groove portion of the C-shaped member, it becomes possible to more firmly fix the electronic component on the substrate or the like. In addition, the biting of the substantially C-shaped member to the lead terminal is improved, and the substantially C-shaped member does not come off, so that the reliability can be improved.
[0015]
Further, according to the present invention, since the lead terminal is thickened by winding the linear member around the lead terminal, it is possible to increase the diameter of the terminal using an existing winding machine or the like, It can be manufactured at low cost. Also, by changing the number of windings, the diameter can be adjusted, and it is possible to quickly meet the needs. Furthermore, when the electronic component using the present invention is soldered to a substrate or the like, the solder flows into the winding of the linear member, so that it is possible to perform more firm fixing.
[0016]
Furthermore, according to the present invention, since the convex portion is formed at the tip portion of the polar terminal, when the terminal is inserted into the hole of the substrate, the convex portion serves as an insertion guide, so that it is easy to insert and the usability is improved. I do.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an exploded perspective view showing one embodiment of the present invention. FIG. 2 is a perspective view showing the back side of the base 24. FIG. 3 is a vertical center end view showing one embodiment of the present invention. FIG. 4 is a plan view showing the leading end of the polar terminal 50. 5A is a perspective view showing a part of the polar terminal 50, FIG. 5B is a perspective view showing a part of the polar terminal 150, and FIG. FIG.
[0018]
The electromagnetic acoustic transducer 1, which is a kind of electronic component, is configured by housing a base 24, a magnetic core 22, a coil 23, a magnet 25, and a diaphragm 20 in a housing 10, and has a flat cylindrical shape as a whole. The overall dimensions are, for example, about 25 mm in diameter x about 12 mm in height.
[0019]
The base 24 has a disk shape having a diameter that fits loosely into the inner diameter of the housing 10, and has two oblong through-holes 24 a separated by a certain distance with respect to the center. The lead terminals 41 and 42 pass through the through-hole 24a, and an electrical insulating portion 32 for preventing a short circuit between them is mounted.
[0020]
A column-shaped magnetic core 22 is erected at the center of the base 24, and a coil 23 is arranged around the magnetic core 22. The base 24 and the magnetic core 22 are formed of a magnetic material, and they may be integrated by caulking or the like to form a single pole piece member.
[0021]
The magnet 25 has a ring shape and is arranged on the base 24 concentrically with the magnetic core 22. An annular internal space is secured between the magnet 25 and the coil 23.
[0022]
The magnet 25 is also used as a support member for supporting the diaphragm 20. As shown in FIG. 3, a plurality of annular steps are formed inside the magnet 25, and a circular base is formed on a horizontal pedestal 28 formed in an annular shape. The vibration plate 20 is placed, and the periphery of the vibration plate 20 is positioned by the annular step.
[0023]
Diaphragm 20 is formed of a magnetic material, and a certain gap is secured between the center of the back surface of diaphragm 20 and the tip of magnetic core 22. A disk-shaped magnetic piece 21 is fixed to the center of the front surface of the diaphragm 20, and the mass of the diaphragm 20 is increased to improve the vibration efficiency of air.
[0024]
The housing 10 is formed of a synthetic resin such as a thermoplastic resin, and is formed in a cylindrical box shape to match the outer diameter of the base 24. A regulating portion 13 for positioning the magnet 25 and the diaphragm 20 is formed on the inner surface of the peripheral wall 12 of the housing 10 to realize the positioning and fixing of the magnet 25 without an adhesive.
[0025]
As shown in FIG. 3, the peripheral wall 12 of the housing 10 and the base 24 are sealed and joined by a filling member 19 such as an adhesive or a mold resin.
[0026]
A sound emission opening 11 having a smaller diameter than the magnetic piece 21 is formed in the top plate of the housing 10 so as to face the vibration plate 20. A displacement restricting portion 14 is formed on the lower surface of the sound emission opening 11 at a predetermined distance from the magnetic piece 21.
[0027]
A coil bobbin 30 for holding the coil 23 is mounted on the magnetic core 22. The coil bobbin 30 is formed of an electrically insulating material such as a synthetic resin, has an upper flange and a lower flange 31 that regulate the upper and lower ends of the coil 23, and further includes the magnetic core 22, the base 24, and the lead terminals together with the electric insulating portion 32. 41 and 42 are integrally formed by insert molding or the like. By such integral molding, the bonding of the coil bobbin 30 becomes unnecessary, the fixing strength of the coil bobbin 30 can be improved, and the manufacturing process can be simplified and the cost can be reduced.
[0028]
The lead terminals 41 and 42 are formed of a solder-plated copper wire or the like having an outer diameter of about 0.8 mm, and protrude from the protruding portions 41a and 42a on the inner surface side of the base 24 and bend in the center direction from the protruding portions 41a and 42a. It has bent portions 41b and 42b and exposed portions protruding from the bent portions 41b and 42b to the outer surface side of the base 24.
[0029]
The protruding portions 41a and 42a protrude in the coil axis direction such that a rotation axis around which the coil wire 23a is wound around the coil bobbin 30 and a rotation axis around which the coil wire 23a is wound around the projection portion are substantially parallel.
[0030]
The bent portions 41b and 42b of the lead terminals 41 and 42 have a function of preventing the lead terminals 41 and 42 from coming off and a function of converting the pitch of the projecting portions 41a and 42a and the pitch of the exposed portion.
[0031]
When the lead terminals 41 and 42 are formed in a straight shape, the lead terminals 41 and 42 are fixed only by friction with the electrical insulating portion 32. On the other hand, when the bent portions 41b and 42b are formed in the middle, Engagement with the support member 32 is strengthened, and it is possible to reliably prevent the protrusion in the longitudinal direction.
[0032]
As shown in FIG. 4, the polarity terminal 50 is a lead terminal whose polarity is shown by fitting a sleeve 51 to a lead terminal 42 which is a positive terminal.
The sleeve 51 is a cylindrical member formed of a metal such as a solder-plated copper wire and having a substantially C-shaped cross section. The outer diameter φ is about 1.6 mm, the inner diameter φ is about 0.75 mm, and the inner peripheral part is press-fitted with the lead terminal 42. It is formed slightly smaller than the diameter of the lead terminal 42 so that it can be fitted. Thus, the sleeve 51 does not come off the lead terminal 42.
[0033]
Further, as shown in FIG. 5A, the lead terminal 42 protrudes from the distal end of the sleeve 51, whereby a step 54 is formed at the distal end of the polar terminal 50. The step 54 is a step protruding from the distal end of the sleeve 51 by about 0.5 mm to 2 mm, and forms a convex at the distal end of the polar terminal 50. When the polar terminal 50 is inserted into and attached to the hole on the external substrate, the lead terminal 42 having a sufficiently small diameter with respect to the hole diameter is first fitted into the convex portion formed by the step portion 54. And the mountability is improved.
[0034]
On the upper and lower surfaces of the sleeve 51, mortar-shaped tapered portions 52 are formed from the outer peripheral portion to the inner peripheral portion of the sleeve 51 to facilitate insertion of the lead terminals 42. Accordingly, when the lead terminal 42 is fitted into the sleeve 51, the lead terminal 42 easily enters the inner peripheral portion of the sleeve 51, and the assemblability is improved.
A substantially V-shaped groove 53 is formed on the side surface of the sleeve 51. When the polar terminal 50 is soldered to an external substrate or the like, the solder flows into the inside of the sleeve 51 and the lead terminal 42 to enhance the bonding force. Further, when the lead terminal 42 is fitted into the sleeve 51, the inner peripheral surface side end 55 of the groove 53 bites into the lead terminal 42, so that the fitting force between the sleeve 51 and the lead terminal 42 is further increased.
[0035]
Next, the operation will be described. The magnet 25 is magnetized in the thickness direction. For example, when the bottom surface of the magnet 25 is magnetized to the N-pole and the top surface thereof is magnetized to the S-pole, the lines of magnetic force coming out of the bottom surface of the magnet 25 become the periphery of the base 24 → the base 24. , The magnetic core 22 → the center of the diaphragm 20 → the peripheral edge of the diaphragm 20 → the upper surface of the magnet 25 to form a closed magnetic circuit as a whole. The magnet 25 has a function of supplying a static magnetic field to such a magnetic circuit, and the diaphragm 20 is stably supported by the magnetic core 22 and the magnet 25 by the static magnetic field.
[0036]
The coil 23 wound around the magnetic core 22 supplies an oscillating magnetic field to the magnetic circuit when an electric vibration signal is supplied from the circuit board via the polar terminal 50, the lead terminals 41 and 42, and the coil wire 23a. Then, the diaphragm 20 vibrates due to the superposition of the static magnetic field and the oscillating magnetic field, and the air on the front side and the air on the back side of the diaphragm 20 vibrate.
[0037]
The sound generated on the front side of the diaphragm 20 is emitted from the sound emission opening 11 to the outside. Since the sound generated on the back side of the diaphragm 20 has an opposite phase to that of the front side sound, the sound is confined in the annular internal space to suppress interference with the front side sound as much as possible.
[0038]
In the above description, an example in which the polar terminal 50 is constituted by the sleeve 51 is shown. In addition, instead of the polar terminal 50, a polar terminal 150 as shown in FIG. Polar terminals 250 as shown may be used.
The polar terminal 150 includes a cylindrical member formed of a metal such as a solder-plated copper wire, and has an outer diameter of about 1.6 mm, an inner diameter of about 0.75 mm, and an inner peripheral part into which the lead terminal 42 can be press-fitted. Thus, the lead terminal 42 is formed slightly smaller than the diameter of the lead terminal 42.
The polar terminal 250 includes a linear member formed of a metal such as a solder-plated copper wire, and forms a sleeve 251 by being spirally wound around the lead terminal 42 by an existing winding machine or the like. By changing the number of turns of the sleeve 251, the diameter of the polar terminal 250 can be freely changed.
[0039]
The sleeve 251 may be formed of a band-shaped metal member. In this case, the thickness of the polar terminal 250 can be freely changed depending on the number of windings.
[0040]
Further, in the above description, the description has been given based on the electromagnetic acoustic transducer 1 as a kind of electronic component, but the present invention is not limited to this, and is applicable to other electronic components such as a microphone, a capacitor, a coil, and the like. It is also possible. In addition, although the description has been made on the case of two lead terminals, three, four or more lead terminals may be used. Two lead terminals have three polar terminals, and four lead terminals have two polar terminals. A configuration of three or three is conceivable. Thus, the configuration is not limited to the number of lead terminals, and any configuration may be used as long as the polarity can be determined.
Further, the above-described step portion 54 is not essential for the purpose of making a specific lead terminal a thick terminal and indicating polarity.
[0041]
As described in detail above, according to the present invention, by covering the lead terminal with the metal member, it is possible to make a specific lead terminal thicker without particularly changing the lead terminal itself. When manufacturing an electronic component having a polar terminal, the manufacturing process can be simplified and the cost can be reduced.
[0042]
Further, since the lead terminal is made thick by fitting the lead terminal into the cylindrical member, a polar terminal having a uniform diameter can be manufactured, and the reliability can be improved.
[0043]
Furthermore, since the lead terminal is made thick by fitting the lead terminal into a member having a substantially C-shaped cross section, when the electronic component using the present invention is soldered to a substrate or the like, the substantially C-shaped Since the solder flows between the lead terminal and the substantially C-shaped member from the groove portion of the member, it is possible to perform more secure fixing. In addition, the bite of the substantially C-shaped member to the lead terminal is improved, and the substantially C-shaped member does not come off, thereby improving reliability.
[0044]
In addition, since the lead terminal is made thick by winding a linear member around the lead terminal, it is possible to make the terminal thick using an existing winding machine or the like, and it is possible to manufacture the terminal at low cost. It is possible. Further, by changing the number of windings, the thickness of the diameter can be adjusted, and it is possible to quickly meet the needs. Furthermore, when the electronic component using the present invention is soldered to a substrate or the like, the solder flows into the winding of the linear member, so that a more secure fixing can be achieved.
[0045]
Furthermore, according to the present invention, since the lead terminal protrudes from the distal end of the metal member, a convex portion is formed at the distal end of the polar terminal. Is used as an insertion guide, which facilitates insertion and improves usability.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing one embodiment of the present invention.
FIG. 2 is a perspective view showing the rear side of the base 24.
FIG. 3 is a vertical center end view showing one embodiment of the present invention.
FIG. 4 is a plan view showing a tip end of a polar terminal 50;
5 (a) is a perspective view showing a polar terminal 50, FIG. 5 (b) is a perspective view showing a polar terminal 150, and FIG. 5 (c) is a perspective view showing a polar terminal 250. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electromagnetic acoustic transducer 10 Housing 11 Sound emission opening 19 Filling member 20 Vibration plate 21 Magnetic piece 22 Magnetic core 23 Coil 23a Coil wire 24 Base 24a Through hole 25 Magnet 30 Coil bobbin 31 Lower flange 32 Electrical insulating parts 41, 42 Lead terminals 41a, 42a Projecting portions 41b, 42b Bending portions 50, 150, 250 Polarity terminals 51, 151, 251 Sleeve 52 Tapered portion 53 Groove portion 54 Step portion 55 Inner peripheral surface end

Claims (5)

In electronic components with two or more lead terminals,
An electronic component having at least one lead terminal covered with a metal member and having a polar terminal having a diameter larger than that of the other lead terminals. The metal member is constituted by a cylindrical member,
The electronic component according to claim 1, wherein a lead terminal is fitted into the cylindrical member. The metal member is constituted by a substantially C-shaped member,
3. The electronic component according to claim 1, wherein a lead terminal is fitted into the substantially C-shaped member. The metal member is constituted by a linear member,
2. The electronic component according to claim 1, wherein the linear member is wound around a lead terminal. The electronic component according to claim 1, wherein a convex portion is formed at a tip of the polar terminal.

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